Angular Material 19 code changes

Proprietary

The @angular/material source changes of the version 19 migration: replaces the deprecated mat.core() with mat.elevation-classes() and mat.app-background(), and sets the prefix of system variables explicitly. UpgradeToAngular19 includes this recipe.

org.openrewrite.angular.material.UpgradeToMaterial19CodeChanges

mod run . --recipe=org.openrewrite.angular.material.UpgradeToMaterial19CodeChanges

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